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Texas Instruments UCC2946DG4
- Part No.:
- UCC2946DG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2946DG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,961
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Product details
Overview
UCC2946DG4 from Texas Instruments is a microprocessor supervisor IC with integrated watchdog timer, programmable reset threshold (1.235 V ±2%), programmable reset period (140–320 ms), and programmable watchdog period (0.96–2.56 s). It operates from 2.1 V to 5.5 V, draws ≤18 µA supply current, and asserts valid reset down to VDD = 1 V - used in industrial embedded systems for reliable power-on and fault recovery.
For engineers reviewing the UCC2946DG4 datasheet, UCC2946DG4 pinout, UCC2946DG4 application, or UCC2946DG4 equivalent, key selection criteria include its wide temperature range (–40°C to +95°C), glitch-immune reset detection, independent RES/WDO outputs, and capacitor-programmable timing parameters critical for deterministic system boot and runtime supervision.
Technical Context
The UCC2946DG4 implements dual independent timing blocks: a precision power-on reset circuit with 400 nA current source charging CRP for reset period control, and a separate watchdog timing block using another 400 nA source charging CWP. Both thresholds reference an internal 1.235 V bandgap, with 15 mV hysteresis to reject noise-induced false triggers.
Its RTH pin monitors external voltage via resistor divider, enabling flexible supply rail or auxiliary voltage supervision; RES and WDO are open-drain outputs with guaranteed low-voltage operation (RES valid at VDD = 1 V, ISINK = 20 µA) and glitch filtering per Figure 1 - ensuring robustness in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 2.1 V to 5.5 V - supports 3.3 V and 5 V systems without level-shifting |
| Reset Threshold | 1.235 V ±2% - accurate trip point set by external R1/R2 divider on RTH pin |
| Reset Period | 140–320 ms (CRP = 64 nF) - programmable delay before RES deassertion after VDD rise |
| Watchdog Period | 0.96–2.56 s (CWP = 64 nF) - configurable timeout for WDI toggling before WDO assertion |
| Supply Current | ≤18 µA - ultra-low quiescent draw enables battery-backed or energy-sensitive designs |
| Reset Validity | Down to VDD = 1 V - ensures RES remains functional during brownout or deep undervoltage |
| Temperature Range | –40°C to +95°C - qualified for industrial-grade operation, not automotive or military |
Pinout & Package
UCC2946DG4 is packaged in an 8-pin SOIC (D package), with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC outline. Pin functions are validated per SLUS247B datasheet and TI official documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| RTH (Pin 2) | Reset threshold input | High-impedance node comparing external voltage to 1.235 V reference; sets reset trip point |
| RES (Pin 3) | Reset output | Open-drain active-low output; drives microprocessor reset pin; valid down to VDD = 1 V |
| RP (Pin 4) | Reset period capacitor | Connects to precision 400 nA current source; CRP value sets reset timeout duration |
| WDI (Pin 5) | Watchdog input | Edge-triggered input; requires high/low or low/high transition within watchdog period to prevent WDO assert |
| WP (Pin 6) | Watchdog period capacitor | Connects to second 400 nA current source; CWP value sets watchdog timeout duration |
| VDD (Pin 8) | Power supply | Input supply rail (2.1–5.5 V); powers internal circuitry and provides reference for WDI thresholds |
| WDO (Pin 7) | Watchdog output | Open-drain active-low output; signals watchdog timeout to NMI or interrupt pin |
Key Features
| Feature | Design Value |
|---|---|
| Fully programmable reset threshold | Set via external R1/R2 divider on RTH pin - enables monitoring of any voltage rail, not just VDD |
| Capacitor-programmable reset period | TRP = CRP × 3.125 (ms/nF) - eliminates need for external RC timing components with poor tolerance |
| Independent watchdog output | WDO remains active even if RES is asserted - allows simultaneous reset and fault signaling |
| Glitch-immune reset detection | Rejects transients <100 mV overdrive for <120 µs (per Fig. 1) - prevents spurious resets in noisy environments |
| Low-voltage reset validity | RES guaranteed functional at VDD = 1 V - ensures fail-safe behavior during severe brownout conditions |
Applications
| Industrial PLC Controller | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Power-up sequencing and runtime fault detection in programmable logic controllers exposed to variable line voltage and EMI. IC Role / Device Role / Timing Role: UCC2946DG4 supervises 3.3 V core supply and generates synchronized reset; WDI tied to FPGA status register toggle. Use Value: Prevents firmware execution during undervoltage and forces controlled recovery upon watchdog timeout - meeting IEC 61000-4-4 immunity requirements. | Use Scenario: Ensuring deterministic boot and continuous health monitoring in portable ultrasound units with battery backup. IC Role / Device Role / Timing Role: UCC2946DG4 monitors both main 5 V rail and isolated 3.3 V analog supply; RES drives ARM Cortex-M reset, WDO feeds safety interrupt. Use Value: Guarantees reset assertion below 1.235 V with 15 mV hysteresis - eliminating false triggers from switching regulator ripple. |
| Telecom Base Station Power Module | Factory Automation Sensor Hub |
Use Scenario: Supervising distributed DC-DC converters in remote radio units operating across –40°C to +95°C ambient. IC Role / Device Role / Timing Role: UCC2946DG4 placed at each converter output; RP and WP capacitors selected for 200 ms reset and 1.6 s watchdog periods. Use Value: Enables field-replaceable module autonomy - no host processor intervention needed for local power fault recovery. | Use Scenario: Reliable startup and lockup detection in multi-sensor IoT gateways deployed in unattended manufacturing cells. IC Role / Device Role / Timing Role: UCC2946DG4 supervises 3.3 V MCU rail; WDI toggled by RTOS heartbeat task; RES connected to microcontroller reset pin. Use Value: 18 µA supply current extends battery life in sleep mode while maintaining full watchdog coverage - critical for >5-year deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | Fixed 1.2 V reset threshold; no programmable watchdog; 1.8–6 V operation | Lacks independent WDO output and capacitor-programmable timing - suitable only for basic reset-only use cases | Select when watchdog functionality is unnecessary and fixed threshold suffices |
| MAX6816EPA+ | Single-supply 5 V operation; 200 ms fixed reset timeout; no programmable watchdog period | Not rated for –40°C to +95°C; lacks RTH input for custom threshold - limited to standard 5 V systems | Choose only for legacy 5 V designs where temperature range and flexibility are secondary |
Compared with TPS3808G12DBVR and MAX6816EPA+, the UCC2946DG4 uniquely supports full parameter programmability (threshold, reset period, watchdog period), extended temperature operation, and dual independent outputs - making it the only option for designs requiring adaptive supervision across diverse voltage rails and environmental conditions.
Availability
UCC2946DG4 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom base station power modules, and factory automation sensor hubs requiring stable component supply and long-term lifecycle support.
Supply support for UCC2946DG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The UCC2946DG4 belongs to TI's microprocessor supervisor product line, designed specifically for deterministic power-on reset generation, brownout protection, and runtime watchdog supervision in harsh industrial environments.
FAQ
What is the operating temperature range for the UCC2946DG4?
The UCC2946DG4 is specified for operation from –40°C to +95°C, qualifying it for industrial-grade applications. This range is distinct from the UCC1946 (–55°C to +125°C) and UCC3946 (0°C to +70°C), and is explicitly confirmed in the SLUS247B datasheet's Electrical Characteristics table under "UCC2946" column and TA specification.
Can the UCC2946DG4 monitor voltages other than VDD?
Yes, the UCC2946DG4 can monitor any external voltage via the RTH pin using a resistor divider. The internal 1.235 V reference compares against the divided voltage, allowing precise reset threshold programming for auxiliary rails (e.g., 1.8 V, 2.5 V, or isolated supplies) - a capability confirmed in the "Programming the Reset Voltage" section of SLUS247B.
How does the UCC2946DG4 handle power supply glitches?
The UCC2946DG4 rejects short-duration, low-amplitude VDD glitches using built-in filtering: transients under 100 mV overdrive lasting less than 120 µs are ignored (per Figure 1). This prevents spurious resets in electrically noisy environments - a design feature verified in the "APPLICATION INFORMATION" section and electrical test conditions.
What capacitor types are recommended for RP and WP pins on the UCC2946DG4?
NPO ceramic capacitors are recommended for both RP and WP pins due to their low leakage, tight tolerance, and stable capacitance over temperature and voltage. The datasheet explicitly states "a high quality, low leakage capacitor (such as an NPO ceramic) should be used" to maintain timing accuracy - critical because CRP and CWP are charged by precision 400 nA current sources.
Is the UCC2946DG4 pin-compatible with UCC3946 or UCC1946?
Yes, the UCC2946DG4 shares identical pinout and function mapping with UCC1946 and UCC3946 across SOIC-8, TSSOP-8, and DIP-8 packages, as confirmed by the shared Connection Diagram and Pin Descriptions in SLUS247B. However, absolute maximum ratings and temperature ranges differ - substitution requires validation of thermal and voltage margin requirements.
UCC2946DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC2946DG4 FAQ
1.How can I place an order for UCC2946DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2946DG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UCC2946DG4 reliable?
The price and inventory of UCC2946DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2946DG4 is usually 5 days.
3.What payment methods are accepted for UCC2946DG4?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2946DG4?
UCC2946DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2946DG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UCC2946DG4?
For technical support, including UCC2946DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2946DG4 requirements.
6.How does Aetrix verify that UCC2946DG4 is sourced from the original manufacturer or authorized distributors?
All UCC2946DG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UCC2946DG4 meets industry standards.
7.What is the process for return or replacement of UCC2946DG4?
All UCC2946DG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2946DG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UCC2946DG4 part is unused and in its original packaging.
Return procedure for UCC2946DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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